I put more time in Fallout 3 and Fallout New Vegas than any other games. I literally replayed the two games over and over again without ever feeling repetitive. I think what I honestly and truthfully like about the genre is that even though the world has nearly ended humanity survives. We still have some resemblance of government and what we used to have. People are still trying to do good even though many others are trying to do unspeakable bad.